

Mudassir Ijaz
Verified Expert in Engineering
Software Developer
Lahore, Punjab, Pakistan
Toptal member since June 23, 2022
Mudassir is an energetic and creative software developer who thrives in challenging environments. With over seven years of experience in software development, Mudassir has honed expertise in both front- and back-end development, mastering technologies like React, Node.js, and PostgreSQL. His passion lies in crafting engaging user interfaces and building robust server-side architecture.
Portfolio
Experience
- JavaScript - 6 years
- Node.js - 6 years
- React - 6 years
- TypeScript - 5 years
- Python - 4 years
- GraphQL - 4 years
- MongoDB - 4 years
- PostgreSQL - 4 years
Preferred Environment
Slack, GitHub, Visual Studio Code (VS Code), Design Tools, React Navigation, Go, Agentic AI, AI Programming
The most amazing...
...project I've built is an ATS for RealREPP, which is used by recruiters to hire hundreds of thousands of candidates and is connected to many US companies.
Work Experience
Senior Full-stack Engineer
Kwanso
- Contributed to RealREPP, an AI-powered recruiting platform based in California, by developing scalable back-end services using Node.js and PostgreSQL, improving candidate matching throughput.
- Designed intelligent filtering and search pipelines leveraging Redis and Elasticsearch, reducing recruiter search response times by 50%.
- Collaborated on front-end enhancements using React, improving recruiter dashboard usability and engagement metrics.
- Built secure REST APIs and optimized database schemas, ensuring high-performance data access for 5,000+ daily recruitment queries.
Software Engineer
Systems Junction
- Developed responsive healthcare interfaces for KHMC Healthcare System using React and modern UI frameworks, improving clinical workflow efficiency.
- Implemented FHIR-compliant data exchange integrations, enabling standardized interoperability across healthcare.
- Contributed to HIPAA-aligned front-end architecture practices, strengthening data security and regulatory compliance.
- Optimized patient record visualization components, reducing load times and improving practitioner accessibility to critical information.
Software Engineer
SAP
- Managed SAP CRM and a customer experience management tool, overseeing critical customer relationship data and ensuring seamless interactions for enhanced customer satisfaction and retention.
- Played a key role in enhancing a front-end portal by introducing new features such as defining an ERP spectrum, collaborating closely with the design team to ensure alignment with project expectations, and delivering a user-centric experience.
- Implemented a comprehensive log of back-end and front-end features on a product, providing detailed insights into system functionalities and user interactions, aiding in troubleshooting and future development.
- Collaborated with AWS on deployment processes, gaining valuable experience and confidence in deploying various web applications efficiently and securely, enhancing skills in cloud deployment and management.
Experience
Bridgetower Marketplace – Retail & Admin Portals with Web3 Payments
https://bridgetowercapital.com/I used AWS services like S3 for bulk file uploading, RDS, CloudWatch, and CloudFront to deploy the front end. I also used IAM to handle admin and user-related queries.
My work also included monitoring bugs and logs using CloudWatch and building secure APIs for the front end, as well as developing back-end authentication with AWS Cognito and creating separate portals for admin inventory management and retail user purchases.
CPUC – Geospatial Visualization of Power & Transmission Lines
https://www.cpuc.ca.gov/To support system performance, I developed AWS Lambda functions in Node.js and Python 3.1, enabling efficient data processing and reliable back-end operations. These optimizations streamlined data management and ensured the application could handle complex workloads effectively. The result was a more scalable, maintainable, and performance-driven solution.
On the front end, I utilized MUI for UI/UX components and customized SCSS to align with California’s design system, ensuring consistency and professional visual appeal. I also integrated a side project into the main codebase, adding stored procedure functions and advanced features to strengthen system capabilities. This effort streamlined operations and accelerated development cycles by nearly 30%.
InstaCoach – AI-powered Coaching & Engagement Platform
https://instacoach.com/To empower data-driven decisions, I built custom dashboards tailored for both coaches and clients. These dashboards improved visibility into performance metrics and user activity, resulting in more informed decision-making. As a direct outcome, the platform achieved a 5% increase in overall conversion rates.
I also created an AI-powered suggestion engine that personalized recommendations based on user preferences, which helped increase retention by 10%. Alongside this, I integrated a real-time chat system powered by Getstream.io, allowing coaches and clients to communicate instantly. This feature drove engagement up by 30% and fostered stronger client relationships.
Scriptify Studio – Connect Screenwriters and Producers Seamlessly
https://xuxecreative.com/In addition, I designed and launched dedicated producer roles within the platform, enabling microdramas to be listed in a marketplace environment. Producers could browse available works seamlessly, send licensing requests directly, and communicate with writers. This addition significantly expanded collaboration opportunities between creators and producers.
To further enhance user engagement, I developed licensing and favoriting features that allowed producers to securely license content and save microdramas for later review. I also fixed key issues in authentication, onboarding, and account setup flows, which helped reduce user drop-off during registration. These improvements improved overall platform accessibility and encouraged more consistent user adoption.
99 Peaks – Scalable Wellness Platform
I migrated the back-end infrastructure to SST, enhancing deployment reliability and simplifying the CI/CD workflow. I also integrated AWS services, including Lambda, RDS, and DynamoDB, to ensure scalability and handle concurrent user growth.
My other contributions included designing and deploying the public-facing website, https://99peaks.life, improving SEO and overall load performance. I also fixed key issues in the internal CMS and streamlined content updates for non-technical users.
Kotn - Clothing Retail Company
https://kotn.com/I seamlessly integrated the front end with Shopify CMS, empowering the content team to manage products and campaigns dynamically. This ensured real-time synchronization of inventory and pricing, enhancing operational efficiency and user trust.
I also led full-cycle deployment to production with a focus on speed, stability, and rollback safety. It optimized build performance and deployment workflows, enabling faster feature releases and smoother scaling during peak sales events.
Storefront - Seamless Space Booking for Unique Events
https://www.thestorefront.com/I implemented Stripe for secure and convenient transactions, leading to a 15% boost in customer satisfaction and repeat purchases.
I also developed algorithms to handpick unique creations based on user preferences, driving a 10% increase in engagement and fostering a personalized shopping experience.
Voiceping - Digital Workplace Software
https://voice-ping.com/en/Introduced interactive whiteboards for faster brainstorming (15% improvement) and real-time screen sharing to reduce confusion (20% enhancement), transforming the meeting experience.
Implemented automated meeting summaries to mitigate missed key points by 15%, ensuring all participants stay informed, even if they join the meeting late.
Skeedee - Powerful Schedule Management System
https://skeedee.com/Users gained control over booking management tools, enabling easy customization and visualization of appointments. This resulted in a 15% rise in weekly appointments and time savings.
Data-driven decisions guided platform improvements, resulting in a more user-centric and efficient booking experience. Integrated Paddle for secure transactions enhanced user trust and contributed to a 10% growth in platform revenue.
Keeper Labs
I established robust authentication protocols and secure user interactions, enhancing data management efficiency by 25% and ensuring platform security.
I also successfully integrated Moralis SDK, Alchemy SDK, Zerion API, and Etherscan API, increasing data retrieval speed by 30% for addresses and various tokens, including fungible and non-fungible tokens, within a comprehensive and user-friendly blockchain financial management experience.
Factor Fi - The Building Blocks of DeFi
I proficiently utilized Redis and Puppeteer technologies for scraping token information crucial for platform operations, enhancing data retrieval speed by 40%.
I also integrated DeFiLlama APIs to broaden platform functionality, providing users with diverse decentralized finance opportunities and resulting in a 20% increase in user engagement.
Xana - Where Billion Dreams Meet Reality
https://xana.net/I established a marketplace for NFTs using the developed tokens, which boosted user engagement by 20% and enhanced the metaverse experience.
I also integrated Orbiter bridge and Chainlink YRF for randomized blind boxes, resulting in a 15% increase in user rewards and an improvement in platform dynamics within a short timeframe. Thanks to my contributions, a $2M sale happened in one hour at most.
KHMC Healthcare System
https://www.khmc.jo/I integrated a highly intricate user interface using Material UI (MUI) and efficiently managed patient records numbering up to half a million. Leveraging MongoDB as the database, I optimized performance through indexing strategies. The tech stack included React and Node.js, with the addition of chat functionality for seamless internal communication among staff.
The system accommodated five distinct user roles effortlessly. By introducing role-based access control, streamlining staff interactions, and incorporating features for medication and insurance management (in collaboration with a 3rd-party firm), system complexity was reduced by 30%.
Furthermore, the implementation of HIPAA compliance protocols enhanced data security and privacy measures. In summary, the addition of role-based access control impacted system complexity positively, reducing it by 40% while enhancing staff interactions and ensuring compliance with HIPAA regulations.
OneStream Live
https://onestream.live/To support creators and businesses, I developed systems that simplify content scheduling and delivery, reducing manual effort while maximizing reach. I also contributed to the integration of external storage solutions, allowing users to manage and retrieve their media efficiently. Additionally, I worked on privacy controls, ensuring flexibility in content accessibility while maintaining a secure streaming environment.
By blending automation, real-time engagement, and interactive elements, this platform redefined how users connect, share, and experience live content—offering a dynamic and scalable solution for modern streaming needs.
Genius Chatbot
I built real-time conversation intelligence that increased user engagement by 25%, using NLP to surface actionable insights. This helped sales and support teams optimize lead qualification and conversions with minimal manual effort.
I also implemented advanced AI-driven personalization, boosting retention by 30% through tailored user journeys. It leveraged behavioral data to deliver relevant responses, strengthening long-term customer relationships.
Poplin - Laundry Marketplace
https://poplin.co/I also integrated Segment.io APIs into the platform to track user interactions and operational events across both admin and customer portals. This enhanced visibility into user behavior and improved event tracking accuracy by 40%, empowering teams to make data-driven product and marketing decisions.
Parkpnp - Discover Ideal Parking Space Now
https://parkpnp.com/ie/I designed an intuitive and user-friendly booking flow that guided users to their desired parking spot in under 30 seconds. This streamlined experience drove a 10% increase in overall conversion rates by reducing friction in the booking process.
I also developed clean, structured, and reusable APIs for efficient data exchange across services and future modules. These improvements enhanced platform scalability and made it easier to integrate new features with minimal refactoring.
Key | Attainable Homeownership with Just 2.5% Down
https://www.keyown.com/Built integrated communication features, driving a 10% user engagement boost and strengthening resident-homeowner collaboration.
Designed and developed user-friendly portals for homeowners, residents, and co-owners, reducing onboarding time by 30% by implementing Certn for smooth identity verifications.
Integrated Plaid, securing transactions and fostering user confidence for a 20% platform adoption increase.
SAID Translations
https://play.google.com/store/apps/details?id=com.said.translations.aiAchieved sub-100ms latency across edge devices through aggressive quantization, KV-cache optimization, and streamlined inference pipelines. Implemented WebLLM with WebGPU acceleration for web and MLC-LLM via native modules on iOS, ensuring cross-platform parity.
Integrated offline speech systems using web speech and SpeechSynthesis APIs (Web) and SFSpeechRecognizer with AVSpeechSynthesizer (iOS). Designed a hybrid reasoning and audit reporting system to support compliance and risk workflows.
Implemented NLLB models using ONNX runtime with support for both mobile GPU and CPU execution, optimizing KV-cache handling and memory layout for high-throughput, low-latency multilingual translation.
Education
Bachelor's Degree in Computer Science
COMSATS University - Lahore, Pakistan
Certifications
Blockchain Basics
University at Buffalo | via Coursera
Certified JavaScript Developer
Online Freelance Agency
Skills
Libraries/APIs
Node.js, React, Three.js, Google API, Lodash, Flexbox, React Query, Context API, Plaid API, API Development, Vue, Apollo Client, D3.js, REST APIs, React Router, React Redux, Stripe, Web3.js, Binance API, React Navigation, Puppeteer, Chart.js, Stripe API, WebGL, Highcharts, WebRTC, Google Maps API, React Testing Library, Stripe Connect, AWS Amplify, Recharts, OpenAPI, Playwright, Socket.IO, Python API, Emotion Library, Zerion API, Emotion, OpenAI API, Segment.io, Drizzle, NumPy, PyTorch, Pandas, Scikit-learn, TensorFlow
Tools
Git, Prisma, JSX, AWS SDK, Plaid, Figma to HTML, Blueprint.js, TanStack Router, Shadcn UI, Claude, Claude Code, Windsurf, Google Analytics, Sequelize, Webpack, Mongoose, Redux Toolkit, Adobe Experience Design (XD), InterSystems Caché, InterSystems Ensemble, ChatGPT, GIS, Figma, RTK Query, Amazon Cognito, AWS IAM, SendGrid, RabbitMQ, Sentry, Shadcn, Expo, Amazon CloudFront, Amazon CloudWatch, Slack, GitHub, Jira, Asana, Confluence, Amazon CloudFront CDN, Knex.js, Kibana, Etherscan, AWS Cloud Development Kit (CDK), Drizzle ORM
Languages
JavaScript, TypeScript, GraphQL, CSS, HTML, Python, SCSS, ECMAScript (ES6), CSS3, Sass, Less, SQL, TypeScript 3, HTML5, Clojure, Ruby, Go, Solidity, Java, SAML
Frameworks
Material UI, Redux, Next.js, NestJS, Bootstrap, Tailwind CSS, React Native, Express.js, LangGraph, Jest, JSON Web Tokens (JWT), Angular, Ruby on Rails (RoR), ClojureScript, Ruby on Rails 5, Ember.js, tRPC, Cypress, Ant Design, OAuth 2, Svelte
Paradigms
Object-oriented Programming (OOP), Testing, API Architecture, Scrum, UX Design, REST, Test-driven Development (TDD), Database Design, Back-end Architecture, REST API Architecture, Code Refactoring, Refactoring, Continuous Delivery (CD), Agile, DevOps, Asynchronous Programming, Microservices, Web Architecture, Unit Testing, Responsive, UI Design, Search Engine Optimization (SEO), Serverless Architecture, Microservices Architecture, Agile Software Development, HIPAA Compliance, Role-based Access Control (RBAC), Model Context Protocol (MCP), Continuous Integration (CI), Jamstack
Platforms
Firebase, Amazon Web Services (AWS), MacOS, AWS Lambda, Google Cloud Platform (GCP), Docker, Blockchain, Robinhood, Vercel, Mapbox, Shopify, Ethereum, Twilio, Amazon EC2, Replit, Visual Studio Code (VS Code), Netlify, Contentful, Azure, Algolia, Twilio Segment, iOS
Storage
MongoDB, PostgreSQL, MySQL, Relational Databases, Redis, QuickBase, JSON, Amazon DynamoDB, Realm, Amazon S3 (AWS S3), Elasticsearch, Cloud Firestore, RDBMS, Google Cloud, Redshift, Data Pipelines, Database Transactions, Cloud Deployment, Databases, PostGIS, NoSQL
Industry Expertise
Healthcare, Telecommunications
Other
APIs, Software Engineering, Dashboards, Front-end, Design Systems, RESTful Web Services, Front-end Architecture, Web Development, Styled-components, Full-stack, Back-end, User Interface (UI), Integration Testing, UI Components, Front-end Development, Full-stack Development, Single-page Applications (SPAs), MERN Stack, Progressive Web Applications (PWAs), API Integration, Enterprise Systems, User Experience (UX), React Hooks, Chakra UI, Responsive UI, Slate, Apollo, Startups, Minimum Viable Product (MVP), Server-side Rendering (SSR), UI Libraries, Software Architecture, Responsive Design, User Profiles, Websites, CSS Animations, Figma to React, Back-end Development, TypeORM, Single Sign-on (SSO), Relational Database Services (RDS), Amazon RDS, RESTFul APIs, DocuSign, Authentication, Tailwind UI, MUI mantis template, UI Frameworks, Amazon API Gateway, Digital Payments, Algorithms, Axios, Fetch API, Webhooks, Async/Await, Blockchain & Cryptocurrency, AI Tools, Prisma Orm, Payments, Localization, Technical Documentation, Performance Optimization, Integration, Gatsby, Apollo Server, Web Dashboards, Component Libraries, UI Development, CI/CD Pipelines, Monorepos, Architecture, Trading, Fintech, Product Management, Cryptocurrency Exchanges, WebAssembly (Wasm), Web Applications, Booking Apps, Payment APIs, Artificial Intelligence (AI), eCommerce, Government, Charts, Middleware, Reports, Applicant Tracking Software (ATS), Cryptocurrency, Web3, Zustand, Crypto, React Components, WebSockets, Headless CMS, AI Integration, Amazon Cognito User Pools, Technical Leadership, Large Language Models (LLMs), OpenAI, TinyMCE, Data Analytics, NextAuth.js, Responsiveness, Pixel Perfect, Real-time Data, Software as a Service (SaaS), Containerization, Data Encryption, Vite, Web Content Accessibility Guidelines (WCAG), DocumentDB, Content Management Systems (CMS), Payment Gateways, A/B Testing, SaaS, Infrastructure as Code (IaC), Leadership, Communication, Enterprise, Cloud, Real-time Communication (RTC), TradingView, Finance, API Design, Supabase, Data Modeling, OAuth, Cursor AI, Health & Wellness, AWS Cloud Security, Learning Management Systems (LMS), Cloudflare, PDF to HTML, Strapi, DMARC, Email Marketing Automation, Debugging, PostGraphile, GitHub Actions, Data Processing, Network Protocols, Know Your Customer (KYC), Document Management, Agentic AI, HIPAA, Health, Healthtech, AI Programming, Machine Learning, Data Mining, Data Visualization, Streaming, Serverless, Lambda Functions, OWASP, Storybook, Design Tools, Semantic UI, Metaverse, Smart Contracts, AWS DevOps, Chatbots, FastAPI, AI Chatbots, Prompt Engineering, OpenID Connect (OIDC), Hash, CRM APIs, Machine Learning Operations (MLOps), LangChain, Retrieval-augmented Generation (RAG), Game Design, Game Development, Narrative Writing, Supabase Auth, GetStream.IO, OnSched, Amazon Route 53, Natural Language Processing (NLP), Privacy, Compliance
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